A method for spraying babbitt coating on steel back of bearing bush
A technology of babbitt alloy and bearing steel, which is applied in the field of preparation and repair of babbitt alloy friction-reducing layer of sliding bearings, can solve problems such as inclusions, sticking guns, equipment, and unstable product quality, and achieve good economic benefits and social benefits Benefits, reducing shutdown over-critical vibration, and improving preparation quality and level
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[0038] The coating material adopts Babbitt alloy powder sold in the market. The particle size and main components of the powder are: Babbitt alloy powder with a particle size of 20-40 microns, the main component is Sn, and the balance: 3.5%≤Cu≤4.5% , 7.5%≤Sb≤8.5%.
[0039] The base material of bearing bush steel back is No. 45 steel. Before spraying, the base is pickled to remove scale, and then cleaned with water. Then carry out flux treatment, the solvent is mainly composed of zinc chloride and ammonium chloride, and the flux is made into a relatively concentrated aqueous solution (the composition ratio of zinc chloride and ammonium chloride is 25:1, and the concentration of the aqueous solution is 85%); The substrate is dip-coated in molten tin at 310°C for 1 min; then take it out and cool it to room temperature.
[0040] When spraying, the base workpiece is fixed on the CNC mobile work platform, and the spray gun is fixed directly above the work platform. When spraying, ...
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